An issue was discovered in Squid 4.x before 4.15 and 5.x before 5.0.6. If a remote server sends a certain response header over HTTP or HTTPS, there is a denial of service. This header can plausibly occur in benign network traffic.

The remote Rocky Linux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the RLSA-2021:4292 advisory.

  - An issue was discovered in Squid before 4.15 and 5.x before 5.0.6. Due to a buffer-management bug, it     allows a denial of service. When resolving a request with the urn: scheme, the parser leaks a small amount     of memory. However, there is an unspecified attack methodology that can easily trigger a large amount of     memory consumption. (CVE-2021-28651)

  - An issue was discovered in Squid before 4.15 and 5.x before 5.0.6. Due to incorrect parser validation, it     allows a Denial of Service attack against the Cache Manager API. This allows a trusted client to trigger     memory leaks that. over time, lead to a Denial of Service via an unspecified short query string. This     attack is limited to clients with Cache Manager API access privilege. (CVE-2021-28652)

  - An issue was discovered in Squid 4.x before 4.15 and 5.x before 5.0.6. If a remote server sends a certain     response header over HTTP or HTTPS, there is a denial of service. This header can plausibly occur in     benign network traffic. (CVE-2021-28662)

  - An issue was discovered in Squid before 4.15 and 5.x before 5.0.6. Due to a memory-management bug, it is     vulnerable to a Denial of Service attack (against all clients using the proxy) via HTTP Range request     processing. (CVE-2021-31806)

  - An issue was discovered in Squid before 4.15 and 5.x before 5.0.6. An integer overflow problem allows a     remote server to achieve Denial of Service when delivering responses to HTTP Range requests. The issue     trigger is a header that can be expected to exist in HTTP traffic without any malicious intent.
    (CVE-2021-31807)

  - An issue was discovered in Squid before 4.15 and 5.x before 5.0.6. Due to an input-validation bug, it is     vulnerable to a Denial of Service attack (against all clients using the proxy). A client sends an HTTP     Range request to trigger this. (CVE-2021-31808)

  - Squid before 4.15 and 5.x before 5.0.6 allows remote servers to cause a denial of service (affecting     availability to all clients) via an HTTP response. The issue trigger is a header that can be expected to     exist in HTTP traffic without any malicious intent by the server. (CVE-2021-33620)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The version of squid installed on the remote host is prior to 4.15-1. It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2SQUID4-2023-004 advisory.

    Squid through 4.14 and 5.x through 5.0.5, in some configurations, allows information disclosure because of     an out-of-bounds read in WCCP protocol data. This can be leveraged as part of a chain for remote code     execution as nobody. (CVE-2021-28116)

    An issue was discovered in Squid before 4.15 and 5.x before 5.0.6. Due to a buffer-management bug, it     allows a denial of service. When resolving a request with the urn: scheme, the parser leaks a small amount     of memory. However, there is an unspecified attack methodology that can easily trigger a large amount of     memory consumption. (CVE-2021-28651)

    An issue was discovered in Squid before 4.15 and 5.x before 5.0.6. Due to incorrect parser validation, it     allows a Denial of Service attack against the Cache Manager API. This allows a trusted client to trigger     memory leaks that. over time, lead to a Denial of Service via an unspecified short query string. This     attack is limited to clients with Cache Manager API access privilege. (CVE-2021-28652)

    An issue was discovered in Squid 4.x before 4.15 and 5.x before 5.0.6. If a remote server sends a certain     response header over HTTP or HTTPS, there is a denial of service. This header can plausibly occur in     benign network traffic. (CVE-2021-28662)

    An issue was discovered in Squid before 4.15 and 5.x before 5.0.6. Due to a memory-management bug, it is     vulnerable to a Denial of Service attack (against all clients using the proxy) via HTTP Range request     processing. (CVE-2021-31806)

    An issue was discovered in Squid before 4.15 and 5.x before 5.0.6. An integer overflow problem allows a     remote server to achieve Denial of Service when delivering responses to HTTP Range requests. The issue     trigger is a header that can be expected to exist in HTTP traffic without any malicious intent.
    (CVE-2021-31807)

    An issue was discovered in Squid before 4.15 and 5.x before 5.0.6. Due to an input-validation bug, it is     vulnerable to a Denial of Service attack (against all clients using the proxy). A client sends an HTTP     Range request to trigger this. (CVE-2021-31808)

    Squid before 4.15 and 5.x before 5.0.6 allows remote servers to cause a denial of service (affecting     availability to all clients) via an HTTP response. The issue trigger is a header that can be expected to     exist in HTTP traffic without any malicious intent by the server. (CVE-2021-33620)

Tenable has extracted the preceding description block directly from the tested product security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Oracle Linux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the ELSA-2021-4292 advisory.

    libecap     squid     [7:4.15-1]
    - new version 4.15
    - Resolves: #1964384 - squid:4 rebase to 4.15

    [7:4.11-5]
    - Resolves: #1944261 - CVE-2020-25097 squid:4/squid: improper input validation       may allow a trusted client to perform HTTP Request Smuggling

Tenable has extracted the preceding description block directly from the Oracle Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Redhat Enterprise Linux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2021:4292 advisory.

    Squid is a high-performance proxy caching server for web clients, supporting FTP, Gopher, and HTTP data     objects.

    The following packages have been upgraded to a later upstream version: squid (4.15). (BZ#1964384)

    Security Fix(es):

    * squid: denial of service in URN processing (CVE-2021-28651)

    * squid: denial of service issue in Cache Manager (CVE-2021-28652)

    * squid: denial of service in HTTP response processing (CVE-2021-28662)

    * squid: improper input validation in HTTP Range header (CVE-2021-31806)

    * squid: incorrect memory management in HTTP Range header (CVE-2021-31807)

    * squid: integer overflow in HTTP Range header (CVE-2021-31808)

    * squid: denial of service in HTTP response processing (CVE-2021-33620)

    For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and     other related information, refer to the CVE page(s) listed in the References section.

    Additional Changes:

    For detailed information on changes in this release, see the Red Hat Enterprise Linux 8.5 Release Notes     linked from the References section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote CentOS Linux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the CESA-2021:4292 advisory.

  - squid: denial of service in URN processing (CVE-2021-28651)

  - squid: denial of service issue in Cache Manager (CVE-2021-28652)

  - squid: denial of service in HTTP response processing (CVE-2021-28662, CVE-2021-33620)

  - squid: improper input validation in HTTP Range header (CVE-2021-31806)

  - squid: incorrect memory management in HTTP Range header (CVE-2021-31807)

  - squid: integer overflow in HTTP Range header (CVE-2021-31808)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

According to the versions of the squid package installed, the EulerOS installation on the remote host is affected by the following vulnerabilities :

  - An issue was discovered in Squid before 4.15 and 5.x before 5.0.6. Due to a buffer-management bug, it     allows a denial of service. When resolving a request with the urn: scheme, the parser leaks a small amount     of memory. However, there is an unspecified attack methodology that can easily trigger a large amount of     memory consumption. (CVE-2021-28651)

  - An issue was discovered in Squid before 4.15 and 5.x before 5.0.6. Due to incorrect parser validation, it     allows a Denial of Service attack against the Cache Manager API. This allows a trusted client to trigger     memory leaks that. over time, lead to a Denial of Service via an unspecified short query string. This     attack is limited to clients with Cache Manager API access privilege. (CVE-2021-28652)

  - An issue was discovered in Squid 4.x before 4.15 and 5.x before 5.0.6. If a remote server sends a certain     response header over HTTP or HTTPS, there is a denial of service. This header can plausibly occur in     benign network traffic. (CVE-2021-28662)

  - An issue was discovered in Squid before 4.15 and 5.x before 5.0.6. Due to a memory-management bug, it is     vulnerable to a Denial of Service attack (against all clients using the proxy) via HTTP Range request     processing. (CVE-2021-31806)

  - An issue was discovered in Squid before 4.15 and 5.x before 5.0.6. An integer overflow problem allows a     remote server to achieve Denial of Service when delivering responses to HTTP Range requests. The issue     trigger is a header that can be expected to exist in HTTP traffic without any malicious intent.
    (CVE-2021-31807)

  - An issue was discovered in Squid before 4.15 and 5.x before 5.0.6. Due to an input-validation bug, it is     vulnerable to a Denial of Service attack (against all clients using the proxy). A client sends an HTTP     Range request to trigger this. (CVE-2021-31808)

  - Squid before 4.15 and 5.x before 5.0.6 allows remote servers to cause a denial of service (affecting     availability to all clients) via an HTTP response. The issue trigger is a header that can be expected to     exist in HTTP traffic without any malicious intent by the server. (CVE-2021-33620)

Note that Tenable Network Security has extracted the preceding description block directly from the EulerOS security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

According to the versions of the squid package installed, the EulerOS installation on the remote host is affected by the following vulnerabilities :

  - An issue was discovered in Squid before 4.15 and 5.x     before 5.0.6. Due to incorrect parser validation, it     allows a Denial of Service attack against the Cache     Manager API. This allows a trusted client to trigger     memory leaks that. over time, lead to a Denial of     Service via an unspecified short query string. This     attack is limited to clients with Cache Manager API     access privilege.(CVE-2021-28652)

  - An issue was discovered in Squid before 4.15 and 5.x     before 5.0.6. Due to a buffer-management bug, it allows     a denial of service. When resolving a request with the     urn: scheme, the parser leaks a small amount of memory.
    However, there is an unspecified attack methodology     that can easily trigger a large amount of memory     consumption.(CVE-2021-28651)

  - An issue was discovered in Squid before 4.15 and 5.x     before 5.0.6. Due to a memory-management bug, it is     vulnerable to a Denial of Service attack (against all     clients using the proxy) via HTTP Range request     processing.(CVE-2021-31806)

  - Squid before 4.15 and 5.x before 5.0.6 allows remote     servers to cause a denial of service (affecting     availability to all clients) via an HTTP response. The     issue trigger is a header that can be expected to exist     in HTTP traffic without any malicious intent by the     server.(CVE-2021-33620)

  - An issue was discovered in Squid 4.x before 4.15 and     5.x before 5.0.6. If a remote server sends a certain     response header over HTTP or HTTPS, there is a denial     of service. This header can plausibly occur in benign     network traffic.(CVE-2021-28662)

  - An issue was discovered in Squid before 4.15 and 5.x     before 5.0.6. Due to an input-validation bug, it is     vulnerable to a Denial of Service attack (against all     clients using the proxy). A client sends an HTTP Range     request to trigger this.(CVE-2021-31808)

  - An issue was discovered in Squid before 4.15 and 5.x     before 5.0.6. An integer overflow problem allows a     remote server to achieve Denial of Service when     delivering responses to HTTP Range requests. The issue     trigger is a header that can be expected to exist in     HTTP traffic without any malicious     intent.(CVE-2021-31807)

Note that Tenable Network Security has extracted the preceding description block directly from the EulerOS security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

An update of the squid package has been released.

The remote SUSE Linux SUSE15 host has a package installed that is affected by multiple vulnerabilities as referenced in the openSUSE-SU-2021:1961-1 advisory.

  - An issue was discovered in Squid through 4.13 and 5.x through 5.0.4. Due to improper input validation, it     allows a trusted client to perform HTTP Request Smuggling and access services otherwise forbidden by the     security controls. This occurs for certain uri_whitespace configuration settings. (CVE-2020-25097)

  - An issue was discovered in Squid before 4.15 and 5.x before 5.0.6. Due to a buffer-management bug, it     allows a denial of service. When resolving a request with the urn: scheme, the parser leaks a small amount     of memory. However, there is an unspecified attack methodology that can easily trigger a large amount of     memory consumption. (CVE-2021-28651)

  - An issue was discovered in Squid before 4.15 and 5.x before 5.0.6. Due to incorrect parser validation, it     allows a Denial of Service attack against the Cache Manager API. This allows a trusted client to trigger     memory leaks that. over time, lead to a Denial of Service via an unspecified short query string. This     attack is limited to clients with Cache Manager API access privilege. (CVE-2021-28652)

  - An issue was discovered in Squid 4.x before 4.15 and 5.x before 5.0.6. If a remote server sends a certain     response header over HTTP or HTTPS, there is a denial of service. This header can plausibly occur in     benign network traffic. (CVE-2021-28662)

  - An issue was discovered in Squid before 4.15 and 5.x before 5.0.6. Due to a memory-management bug, it is     vulnerable to a Denial of Service attack (against all clients using the proxy) via HTTP Range request     processing. (CVE-2021-31806)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The remote SUSE Linux SUSE15 host has a package installed that is affected by multiple vulnerabilities as referenced in the openSUSE-SU-2021:0879-1 advisory.

  - An issue was discovered in Squid through 4.13 and 5.x through 5.0.4. Due to improper input validation, it     allows a trusted client to perform HTTP Request Smuggling and access services otherwise forbidden by the     security controls. This occurs for certain uri_whitespace configuration settings. (CVE-2020-25097)

  - An issue was discovered in Squid before 4.15 and 5.x before 5.0.6. Due to a buffer-management bug, it     allows a denial of service. When resolving a request with the urn: scheme, the parser leaks a small amount     of memory. However, there is an unspecified attack methodology that can easily trigger a large amount of     memory consumption. (CVE-2021-28651)

  - An issue was discovered in Squid before 4.15 and 5.x before 5.0.6. Due to incorrect parser validation, it     allows a Denial of Service attack against the Cache Manager API. This allows a trusted client to trigger     memory leaks that. over time, lead to a Denial of Service via an unspecified short query string. This     attack is limited to clients with Cache Manager API access privilege. (CVE-2021-28652)

  - An issue was discovered in Squid 4.x before 4.15 and 5.x before 5.0.6. If a remote server sends a certain     response header over HTTP or HTTPS, there is a denial of service. This header can plausibly occur in     benign network traffic. (CVE-2021-28662)

  - An issue was discovered in Squid before 4.15 and 5.x before 5.0.6. Due to a memory-management bug, it is     vulnerable to a Denial of Service attack (against all clients using the proxy) via HTTP Range request     processing. (CVE-2021-31806)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The remote SUSE Linux SLES15 / SLES_SAP15 host has a package installed that is affected by multiple vulnerabilities as referenced in the SUSE-SU-2021:1961-1 advisory.

  - An issue was discovered in Squid through 4.13 and 5.x through 5.0.4. Due to improper input validation, it     allows a trusted client to perform HTTP Request Smuggling and access services otherwise forbidden by the     security controls. This occurs for certain uri_whitespace configuration settings. (CVE-2020-25097)

  - An issue was discovered in Squid before 4.15 and 5.x before 5.0.6. Due to a buffer-management bug, it     allows a denial of service. When resolving a request with the urn: scheme, the parser leaks a small amount     of memory. However, there is an unspecified attack methodology that can easily trigger a large amount of     memory consumption. (CVE-2021-28651)

  - An issue was discovered in Squid before 4.15 and 5.x before 5.0.6. Due to incorrect parser validation, it     allows a Denial of Service attack against the Cache Manager API. This allows a trusted client to trigger     memory leaks that. over time, lead to a Denial of Service via an unspecified short query string. This     attack is limited to clients with Cache Manager API access privilege. (CVE-2021-28652)

  - An issue was discovered in Squid 4.x before 4.15 and 5.x before 5.0.6. If a remote server sends a certain     response header over HTTP or HTTPS, there is a denial of service. This header can plausibly occur in     benign network traffic. (CVE-2021-28662)

  - An issue was discovered in Squid before 4.15 and 5.x before 5.0.6. Due to a memory-management bug, it is     vulnerable to a Denial of Service attack (against all clients using the proxy) via HTTP Range request     processing. (CVE-2021-31806)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Ubuntu 18.04 LTS / 20.04 LTS host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-4981-1 advisory.

    Joshua Rogers discovered that Squid incorrectly handled requests with the urn: scheme. A remote attacker     could possibly use this issue to cause Squid to consume resources, leading to a denial of service.
    (CVE-2021-28651)

    Joshua Rogers discovered that Squid incorrectly handled requests to the Cache Manager API. A remote     attacker with access privileges could possibly use this issue to cause Squid to consume resources, leading     to a denial of service. This issue was only addressed in Ubuntu 20.04 LTS, Ubuntu 20.10, and Ubuntu 21.04.
    (CVE-2021-28652)

    Joshua Rogers discovered that Squid incorrectly handled certain response headers. A remote attacker could     possibly use this issue to cause Squid to crash, resulting in a denial of service. This issue was only     affected Ubuntu 20.04 LTS, Ubuntu 20.10, and Ubuntu 21.04. (CVE-2021-28662)

    Joshua Rogers discovered that Squid incorrectly handled range request processing. A remote attacker could     possibly use this issue to cause Squid to crash, resulting in a denial of service. (CVE-2021-31806,     CVE-2021-31807, CVE-2021-31808)

    Joshua Rogers discovered that Squid incorrectly handled certain HTTP responses. A remote attacker could     possibly use this issue to cause Squid to crash, resulting in a denial of service. (CVE-2021-33620)

Tenable has extracted the preceding description block directly from the Ubuntu security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

This update for squid fixes the following issues :

update to 4.15 :

CVE-2021-28652: Broken cache manager URL parsing (bsc#1185918)

CVE-2021-28651: Memory leak in RFC 2169 response parsing (bsc#1185921)

CVE-2021-28662: Limit HeaderLookupTable_t::lookup() to BadHdr and specific IDs (bsc#1185919)

CVE-2021-31806: Handle more Range requests (bsc#1185916)

CVE-2020-25097: HTTP Request Smuggling vulnerability (bsc#1183436)

Handle more partial responses (bsc#1185923)

fix previous change to reinstante permissions macros, because the wrong path has been used (bsc#1171569).

use libexecdir instead of libdir to conform to recent changes in Factory (bsc#1171164).

Reinstate permissions macros for pinger binary, because the permissions package is also responsible for setting up the cap_net_raw capability, currently a fresh squid install doesn't get a capability bit at all (bsc#1171569).

Change pinger and basic_pam_auth helper to use standard permissions.
pinger uses cap_net_raw=ep instead (bsc#1171569)

Note that Tenable Network Security has extracted the preceding description block directly from the SUSE security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

Multiple denial of service vulnerabilities were discovered in the Squid proxy caching server.

The remote host is affected by the vulnerability described in GLSA-202105-14 (Squid: Multiple vulnerabilities)

    Multiple vulnerabilities have been discovered in Squid. Please review       the CVE identifiers referenced below for details.
  Impact :

    A remote attacker could send a specially crafted request, possibly       resulting in a Denial of Service condition or information leak.
  Workaround :

    There is no known workaround at this time.

ID	Name	Product	Family	Severity
185083	Rocky Linux 8 : squid:4 (RLSA-2021:4292)	Nessus	Rocky Linux Local Security Checks	high
181987	Amazon Linux 2 : squid (ALASSQUID4-2023-004)	Nessus	Amazon Linux Local Security Checks	medium
155429	Oracle Linux 8 : squid:4 (ELSA-2021-4292)	Nessus	Oracle Linux Local Security Checks	high
155209	RHEL 8 : squid:4 (RHSA-2021:4292)	Nessus	Red Hat Local Security Checks	high
155039	CentOS 8 : squid:4 (CESA-2021:4292)	Nessus	CentOS Local Security Checks	high
153671	EulerOS 2.0 SP5 : squid (EulerOS-SA-2021-2519)	Nessus	Huawei Local Security Checks	high
152405	EulerOS 2.0 SP8 : squid (EulerOS-SA-2021-2317)	Nessus	Huawei Local Security Checks	high
151967	Photon OS 4.0: Squid PHSA-2021-4.0-0063	Nessus	PhotonOS Local Security Checks	medium
151955	Photon OS 3.0: Squid PHSA-2021-3.0-0269	Nessus	PhotonOS Local Security Checks	medium
151713	openSUSE 15 Security Update : squid (openSUSE-SU-2021:1961-1)	Nessus	SuSE Local Security Checks	high
151071	openSUSE 15 Security Update : squid (openSUSE-SU-2021:0879-1)	Nessus	SuSE Local Security Checks	high
150734	SUSE SLES15 Security Update : squid (SUSE-SU-2021:1961-1)	Nessus	SuSE Local Security Checks	high
150232	Ubuntu 18.04 LTS / 20.04 LTS : Squid vulnerabilities (USN-4981-1)	Nessus	Ubuntu Local Security Checks	high
150212	SUSE SLES12 Security Update : squid (SUSE-SU-2021:1838-1)	Nessus	SuSE Local Security Checks	high
150165	Debian DSA-4924-1 : squid - security update	Nessus	Debian Local Security Checks	high
150021	GLSA-202105-14 : Squid: Multiple vulnerabilities	Nessus	Gentoo Local Security Checks	high

Detections

Analytics

CVE-2021-28662

medium

Tenable Plugins

high

medium

high

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high

high

high

medium

medium

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high